메타데이터
| 항목 |
값 |
| Designation |
C/2012 H2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-05-03T17:33:48.790080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:07Z |
| Obs used |
40 |
| NEO |
- |
| M1 |
15.700 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2012-05-18.0000000 |
| e |
0.89360944 |
| q (au) |
1.716772 |
| a (au) |
16.136509 |
| i (deg) |
92.835585 |
| Ω (om, deg) |
184.135948 |
| ω (w, deg) |
295.901982 |
| M (ma, deg) |
0.216949 |
밝기
산란 + 전체 선형
$$
M_a = (15.846 + 4.599\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.846 |
| n |
4.599 |
| gf |
1.000 |
| gb |
-0.576 |
| k |
0.800 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
19:37:34.18 |
+68:36:39.6 |
HIP 96662 |
9.11 |
| 2026-09-20 12:00 |
19:37:29.62 |
+68:35:30.1 |
HIP 96662 |
9.88 |
| 2026-09-21 00:00 |
19:37:25.16 |
+68:34:20.4 |
HIP 96662 |
10.73 |
| 2026-09-21 12:00 |
19:37:20.82 |
+68:33:10.3 |
HIP 96662 |
11.64 |
| 2026-09-22 00:00 |
19:37:16.58 |
+68:32:00.0 |
HIP 96662 |
12.61 |
| 2026-09-22 12:00 |
19:37:12.47 |
+68:30:49.5 |
HIP 96662 |
13.61 |
| 2026-09-23 00:00 |
19:37:08.46 |
+68:29:38.7 |
HIP 96662 |
14.64 |
| 2026-09-23 12:00 |
19:37:04.56 |
+68:28:27.6 |
HIP 96662 |
15.70 |
| 2026-09-24 00:00 |
19:37:00.78 |
+68:27:16.3 |
HIP 96662 |
16.77 |
| 2026-09-24 12:00 |
19:36:57.11 |
+68:26:04.8 |
HIP 96662 |
17.87 |
| 2026-09-25 00:00 |
19:36:53.55 |
+68:24:53.0 |
HIP 96662 |
18.98 |
| 2026-09-25 12:00 |
19:36:50.11 |
+68:23:41.1 |
HIP 96662 |
20.10 |
| 2026-09-26 00:00 |
19:36:46.77 |
+68:22:28.8 |
HIP 96662 |
21.23 |
| 2026-09-26 12:00 |
19:36:43.55 |
+68:21:16.4 |
HIP 96662 |
22.37 |
| 2026-09-27 00:00 |
19:36:40.44 |
+68:20:03.8 |
HIP 96662 |
23.52 |
| 2026-09-27 12:00 |
19:36:37.45 |
+68:18:50.9 |
HIP 96662 |
24.67 |
| 2026-09-28 00:00 |
19:36:34.57 |
+68:17:37.9 |
HIP 96662 |
25.83 |
| 2026-09-28 12:00 |
19:36:31.80 |
+68:16:24.7 |
HIP 96662 |
27.00 |
| 2026-09-29 00:00 |
19:36:29.14 |
+68:15:11.2 |
HIP 96662 |
28.17 |
| 2026-09-29 12:00 |
19:36:26.60 |
+68:13:57.6 |
HIP 96298 |
27.34 |
| 2026-09-30 00:00 |
19:36:24.17 |
+68:12:43.9 |
HIP 96298 |
26.11 |
| 2026-09-30 12:00 |
19:36:21.85 |
+68:11:29.9 |
HIP 96298 |
24.89 |
| 2026-10-01 00:00 |
19:36:19.64 |
+68:10:15.8 |
HIP 96298 |
23.66 |
| 2026-10-01 12:00 |
19:36:17.55 |
+68:09:01.5 |
HIP 96298 |
22.44 |
| 2026-10-02 00:00 |
19:36:15.57 |
+68:07:47.0 |
HIP 96298 |
21.22 |
| 2026-10-02 12:00 |
19:36:13.70 |
+68:06:32.4 |
HIP 96298 |
20.02 |
| 2026-10-03 00:00 |
19:36:11.95 |
+68:05:17.7 |
HIP 96298 |
18.82 |
| 2026-10-03 12:00 |
19:36:10.31 |
+68:04:02.8 |
HIP 96298 |
17.63 |
| 2026-10-04 00:00 |
19:36:08.78 |
+68:02:47.8 |
HIP 96298 |
16.45 |
| 2026-10-04 12:00 |
19:36:07.37 |
+68:01:32.6 |
HIP 96298 |
15.29 |
| 2026-10-05 00:00 |
19:36:06.07 |
+68:00:17.3 |
HIP 96298 |
14.15 |
| 2026-10-05 12:00 |
19:36:04.88 |
+67:59:01.9 |
HIP 96298 |
13.04 |
| 2026-10-06 00:00 |
19:36:03.81 |
+67:57:46.4 |
HIP 96298 |
11.96 |
| 2026-10-06 12:00 |
19:36:02.85 |
+67:56:30.8 |
HIP 96298 |
10.93 |
| 2026-10-07 00:00 |
19:36:02.00 |
+67:55:15.1 |
HIP 96298 |
9.95 |
| 2026-10-07 12:00 |
19:36:01.26 |
+67:53:59.3 |
HIP 96298 |
9.06 |
| 2026-10-08 00:00 |
19:36:00.64 |
+67:52:43.4 |
HIP 96298 |
8.27 |
| 2026-10-08 12:00 |
19:36:00.13 |
+67:51:27.4 |
HIP 96298 |
7.62 |
| 2026-10-09 00:00 |
19:35:59.73 |
+67:50:11.3 |
HIP 96298 |
7.15 |
| 2026-10-09 12:00 |
19:35:59.45 |
+67:48:55.2 |
HIP 96298 |
6.89 |
| 2026-10-10 00:00 |
19:35:59.27 |
+67:47:39.0 |
HIP 96298 |
6.87 |
| 2026-10-10 12:00 |
19:35:59.21 |
+67:46:22.7 |
HIP 96298 |
7.09 |
| 2026-10-11 00:00 |
19:35:59.27 |
+67:45:06.4 |
HIP 96298 |
7.54 |